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Implement ns lookup allowlist (#1420)

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The ns-lookup accepts domain names as well as suffixes, e.g.:

```
--allow-resolve=* # allow all domain names
--allow-resolve=example.com # only allow example.com name resolution
--allow-resolve=example.com --allow-resolve=*.example.com # allow example.com and its subdomains' name resolution
```
This commit is contained in:
Marcin Kolny
2022-09-02 13:26:31 +02:00
committed by GitHub
parent df782c5f2a
commit 9a04c21075
12 changed files with 236 additions and 91 deletions
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8
doc/socket_api.md
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@ -64,6 +64,14 @@ should be announced first. Every IP address should be in CIRD notation.
$ iwasm --addr-pool=1.2.3.4/15,2.3.4.6/16 socket_example.wasm
```
_iwasm_ also accepts list of domain names and domain name patterns for the address resolution via an option, `--allow-resolve`, to implement the capability control. Every domain that will be resolved using `sock_addr_resolve` needs to be added to the allowlist first.
```bash
$ iwasm --allow-resolve=*.example.com --allow-resolve=domain.com
```
The example above shows how to allow for resolving all `example.com`'s subdomains (e.g. `x.example.com`, `a.b.c.example.com`) and `domain.com` domain.
Refer to [socket api sample](../samples/socket-api) for more details.
## Intel SGX support